• Login
    View Item 
    •   Home
    • Colleges, Departments, and Organizations
    • Arizona Geological Survey (AZGS)
    • AZGS Document Repository
    • View Item
    •   Home
    • Colleges, Departments, and Organizations
    • Arizona Geological Survey (AZGS)
    • AZGS Document Repository
    • View Item
    JavaScript is disabled for your browser. Some features of this site may not work without it.

    Browse

    All of UA Campus RepositoryCommunitiesTitleAuthorsIssue DateSubmit DateSubjectsPublisherJournalThis CollectionTitleAuthorsIssue DateSubmit DateSubjectsPublisherJournal

    My Account

    LoginRegister

    About

    AboutUA Faculty PublicationsUA DissertationsUA Master's ThesesUA Honors ThesesUA PressUA YearbooksUA CatalogsUA Libraries

    Statistics

    Most Popular ItemsStatistics by CountryMost Popular Authors

    Reconnaissance study of mylonitic fabrics in the Bellota Ranch area, eastern Santa Catalina Mountains, Arizona

    • CSV
    • RefMan
    • EndNote
    • BibTex
    • RefWorks
    Thumbnail
    Name:
    cr-20-cesantacatalina.pdf
    Size:
    41.28Mb
    Format:
    PDF
    Description:
    CR-20-C Report(PDF)
    Download
    Thumbnail
    Name:
    azgs_cr-20-c_appendix_a_-_bell ...
    Size:
    10.73Mb
    Format:
    application/zip
    Description:
    CR-20-C (Appendix 1 - Powerpoi ...
    Download
    Author
    Spencer, J.E
    Constenius, K.N.
    Affiliation
    Arizona Geological Survey
    Issue Date
    2020
    Keywords
    Arizona Geological Survey Contributed Reports
    Metamorphic
    core complex
    detachment fault
    gneiss
    mylonite
    Bellota Ranch
    Molino Basin
    Pima County
    Rincon Mountains
    San Pedro River Valley
    Santa Catalina Mountains
    Cenozoic
    Miocene
    Proterozoic
    Tertiary
    Show allShow less
    
    Metadata
    Show full item record
    Citation
    Spencer, J.E. and Constenius, K.N., 2020, Reconnaissance study of mylonitic fabrics in the Bellota Ranch area, eastern Santa Catalina Mountains, Arizona. Arizona Geological Survey Contributed Report CR-20-C, 12 p, one appendix.
    Publisher
    Arizona Geological Survey (Tucson, AZ)
    Description
    The Santa Catalina Mountains in southeastern Arizona include extensive mylonitic fabrics developed within granitic and gneissic rocks that make up most of the range. These fabrics are strongest at the southern foot of the range where they dip south and project beneath the rangebounding Catalina – San Pedro detachment fault. Shear sense in the mylonitic rocks is primarily top-southwest, consistent with shearing down-dip from the detachment fault during early normal faulting and exhumation to form the metamorphic core complex. Two to three kilometers north of the foot of the Santa Catalina Mountains the mylonitic foliation is horizontal and farther north it dips to the north. The mylonitic fabrics thus dip outward from the axis of the Forerange arch with primarily top-northeast shear-sense indicators on the north side of the arch. This dominantly topnortheast fabric forms the Molino Basin shear zone, which continues eastward toward the Bellota Ranch area that is the subject of this study. We found that mylonitic fabrics in the Bellota Ranch area are generally subhorizontal, weak, and without clear shear-sense indicators in by far ost outcrops. Four days of field study yielded clear shear-sense indicators at only eight outcrops, with six of them indicating top-southwest shear sense. We were not able to divide mylonitic rocks into top-southwest and top-northeast zones as in a previous study by Bykerk-Kauffman (2008). Lineation trend gradually changes laterally from more northeasterly in the Molino Basin area to more northerly in the Bellota Ranch area. As with the Molino Basin area, lineations associated with top-northeast shearing generally trend more northerly than lineations associated with top-southwest shearing. We conclude that mylonitic lineation in the Bellota anch area is not a simple continuation of the Molino Basin shear zone as it is dominated by top-southwest shear-sense indicators rather than top-northeast as with the Molino Basin shear zone.
    URI
    http://hdl.handle.net/10150/642094
    Additional Links
    http://repository.azgs.az.gov/uri_gin/azgs/dlio/1951
    Language
    en
    Series/Report no.
    CR-20-C
    Rights
    Arizona Geological Survey. All rights reserved.
    Collection Information
    Documents in the AZGS Documents Repository collection are made available by the Arizona Geological Survey (AZGS) and the University Libraries at the University of Arizona. For more information about items in this collection, please contact azgs-info@email.arizona.edu.
    North Bounding Coordinate
    32.5168
    South Bounding Coordinate
    32.3476
    West Bounding Coordinate
    -110.786
    East Bounding Coordinate
    -110.556
    Collections
    AZGS Document Repository

    entitlement

     
    The University of Arizona Libraries | 1510 E. University Blvd. | Tucson, AZ 85721-0055
    Tel 520-621-6442 | repository@u.library.arizona.edu
    DSpace software copyright © 2002-2017  DuraSpace
    Quick Guide | Contact Us | Send Feedback
    Open Repository is a service operated by 
    Atmire NV
     

    Export search results

    The export option will allow you to export the current search results of the entered query to a file. Different formats are available for download. To export the items, click on the button corresponding with the preferred download format.

    By default, clicking on the export buttons will result in a download of the allowed maximum amount of items.

    To select a subset of the search results, click "Selective Export" button and make a selection of the items you want to export. The amount of items that can be exported at once is similarly restricted as the full export.

    After making a selection, click one of the export format buttons. The amount of items that will be exported is indicated in the bubble next to export format.